On this day in 1917 Jeanette Pickering Rankin was sworn in as the first woman elected to the United States House of Representatives, representing Montana. Already a suffragist who had participated in successful campaigns to bring women the vote in Washington and Montana, she took office in Congress at a time when many women in the United States were still disenfranchised.

One of Rankin’s first major acts in Congress was voting against the United States’ participation in World War I. A lifelong pacifist, she was one of only 50 representatives who voted against the war resolution, saying, “I felt the first time the first woman had a chance to say no to war she should say it.” During her later second term in office, Rankin also voted against the country’s entrance into World War II, and in this case she stood alone amongst the entire Congress and had to call congressional police for an escort when an angry mob followed her home after the vote.